Suitable Dietary Protein/Lipid Ratio for Hybrid, Female Red Sea Bream Pagrus major and Male Black Sea Bream Acanthopagrus schlegeli in the Juvenile Stage, Compared with Red Sea Bream

Yang-Su Kim, Seung-Cheol Ji, Amal Biswas, Biswajit Kumar Biswas, Annita Seok Kian Yong, Osamu Takaoka, Gwan-Sik Jeong, Osamu Murata, Kenji Takii
2014 Fisheries and Aquatic Sciences  
To determine a suitable dietary protein/lipid (CP/CL) ratio in the early juvenile stages of hybrid porgy (F 1 ), female red sea bream (RSB) × male black sea bream, five diets with various CP/CL ratios-60/7, 55/12, 51/17, 46/23, and 41/28-were prepared and provided to juveniles in triplicate. At the smaller juvenile stage, F 1 , weighing 0.32 g, a significantly higher specific growth rate (SGR) and feed efficiency (FE) were seen with 60/7 and 55/12 diets. However, in RSB weighing 0.26 g, SGR and
more » ... ing 0.26 g, SGR and FE were higher with the 60/7 diet than the other diets at 21°C. At the larger juvenile stage, F 1 , weighing 3.7 g, there was no significant difference in SGR or FE among the diets, but RSB weighing 4.0 g fed 60/7, 55/12, and 51/17 diets had higher SGR and FE than 46/23 and 41/28 diets at 24°C. Moreover, survival and apparent nutrient retention of F 1 at both stages were significantly higher than those in RSB. These results indicate that both F 1 and RSB weighing ca. 0.3 g require a higher dietary CP/CL than those weighing ca. 4 g. Additionally, F 1 in both trials showed the suitability of a lower dietary CP/CL than RSB, indicating that mass production of F 1 juveniles will be more economical than RSB.
doi:10.5657/fas.2014.0075 fatcat:6zmnoahbpfc2tknvieef6wi2ea